Some bodies, such as the small versions of the NSX and 12C bodies, have much smaller engine bays than previously; the one in the latter is now back to Kee size and can no longer fit big engines. I am in favor of this change, though; I must admit that the ability to plonk a big motor in either body felt quite unrealistic.

You should have known this by now. Why not fit a 2.0L I4 transversely, like I did, and pitch the resulting car as an Elise rival?

Other engines, such as a 3.0L V6, can be used instead, if you feel so inclined. Or you can wait for the large version of the 12C body to be added to UE4 and use that for your project.

The test build I just made recently is powered by an undersquare 2.0L V6 that just barely fits whether it’s mounted transversely or longitudinally. So yes, the engine bay has indeed shrunk - with the former option it’s now actually wider than it is long. However, the car below has a longitudinally mounted engine, and even this option doesn’t give you much more space to work with.